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Old 12-05-2012, 09:02 PM   #1 (permalink)
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79 Exciter 440 (Yamaha)

I Just bought a 79 Exciter 440, i pulled the main bolt out of the clutch to replace the primary sheave, it was shattered in pieces. Anywho, i got the old clutch off and went to put the new one on and the main bolt wont screw into the crank all the way, it screws in about 4 turns then gets really tight. any chances when i removed that bolt that it messed up the threads? If so what size are these threads inside the crank so i can try and Tap them to straighten them out. If that doesnt work it looks like ill need a new crank. Any information would be appreciated.
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Old 12-06-2012, 01:12 AM   #2 (permalink)
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first thing id do is make sure the whole
bolt is out, but for sure chase the threads!!
also spray some pb blaster while taping out.
after done make sure to clean threads with brake
cleaner.
as for the tap size, either match up to new
bolt, or..........
wait for yamadad to ans. im sure he knows!!!!!

good luck
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Old 12-06-2012, 05:39 AM   #3 (permalink)
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I tilted the sled on its side and sprayed Pb blaster in the shaft and let it sit for a night. the threads on the original bolt are still perfectly in tact. I got frustrated with it and walked away last night, plan on waiting until the weekend to sit down and mess with it.
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Old 12-06-2012, 09:42 PM   #4 (permalink)
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1/2"x 18 comes to mind as the thread pitch, but you would be wise to confirm prior to inserting any thread cleaning implements.
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Old 12-06-2012, 11:55 PM   #5 (permalink)
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Sounds like you might have cross threaded it.
Does the end of the bolt threads look as if they are trying to cut new ones?
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Old 12-07-2012, 05:44 AM   #6 (permalink)
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Then very end of the Bolt looks a little out of place now that i look at it. the first two threads look a little different than the others. Should i just get a new bolt or try and run a Die on the old one? Threads inside the crank dont look out of place to my eyes.
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Old 12-07-2012, 07:50 AM   #7 (permalink)
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You may want to try threading the bolt without the sheave on. I find that the weight of the sheave causes resistance to threading it. If the bolt threads on fine without the sheave, then try to support the weight of the sheave while your trying to thread the bolt, i.e. pulling up on the sheave.
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